Capitalized Exploratory Well Costs (Tables)

9 Months Ended

Sep. 30, 2017

Capitalized Exploratory Well Costs [Abstract]

Net Changes in Capitalized Exploratory Well Costs

The following table discloses the net changes in capitalized exploratory well costs pending determination of proved reserves during the nine months ended September 30, 2017 (in millions):

Balance at January 1, 2017	$	597
Additions to capitalized exploratory well costs pending the determination of proved reserves		83
Reclassifications to wells, facilities and equipment based on the determination of proved reserves		(177	)
Balance at September 30, 2017	$	503